Internal combustion engine



FIG. 1 is a front view of an internal combustion engine showing our newdesign;

FIG. 2 is a rear view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a right side view of FIG. 1;

FIG. 5 is a top plan view of FIG. 1; and,

FIG. 6 is a bottom plan view of FIG. 1.

The broken lines shown in the drawings are for the purpose ofillustrating portions of the article and form no part of the claimeddesign.

CLAIM The ornamental design for an internal combustion engine, as shownand described.